Note: Please measure the inner diameter of your coffee basket before purchasing a tamper. You can purchase a tamper based on the inner diameter of your coffee This step is very important. In case you buy the wrong size. 51mm tamper is suitable for 51mm portafilter. 53mm tamper is suitable for 53mm and 54mm portafilter. 58mm tamper is suitable for 58mm portafilter. 1.Unique Design: Coffee tamper consists of a 304 stainless steel base and an ergonomic handle with a comfortable grip and premium texture. It is highly polished and easy to clean. 2.Consistent Pressure :This calibrated tamper offers an optimal mashing power of 30 pounds, which will give you consistent distribution and pressure every time, avoiding deviations in the making process and achieving an even extraction of coffee. 3.Using tips:Rotate the tamper around the edges of the portafilter as you tamp to get a more even distribution. 4.More Sizing Options:We offer a variety of sizes such as 51mm, 53mm, 58mm tamper compatible with various sizes of flat bottomless portafilter. Please Use a tamper that has the same diameter as your portafilter basket for a better seal. Item Name:Calibrated Spring Tamper Material: 304 Stainless Steel Base+Aluminum Handle. Calibrated Spring Loaded: 30Pounds Base Diameter: 51mm/ 2inch, 53mm/2.08inch, 58mm/2.28inch. Package Included: 1Pcs *Calibrated Spring Tamper. Notice: Please allow 1-3mm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures.